The pie chart given below shows the number of laptops sold of each of 7 different brands in a year as percentages of the total number of laptops sold of all these 7 brands taken together in that year.

What is the difference between the measures of the central angles made by sector B2 and sector B5?

A

$$16.66^{\circ}$$

B

$$21.6^{\circ}$$

C

$$14.4^{\circ}$$

D

$$7.2^{\circ}$$